Mouthpiece



FIG. 1 is a perspective view of the mouthpiece showing our new design;

FIG. 2 is a side view of the mouthpiece of FIG. 1;

FIG. 3 is a front view of the mouthpiece of FIG. 1.

FIG. 4 is a back view of the mouthpiece of FIG. 1.

FIG. 5 is a bottom view of the mouthpiece of FIG. 1; and,

FIG. 6 is a top view of the mouthpiece of FIG. 1.

All surfaces not shown form no part of the claimed design.

The portion of the figures shown in dashed lines forms no part of the claimed design. 

The ornamental design for a mouthpiece, as shown and described. 